Specification: Frequency type : UHF frequency Material: CNC Aluminum Alloy Sensitivity: ﹣33dB Pick-up patterm: omni-directional conderser microphone Input: 3.5TES clip-On microphone + external voice input(transmitter) Output: 3.5mmTRS(camera)+3.5mm TRS Standard transmission distance : 100M(line of sight) Battery working time :TX-3hours RX-4hours(chargeable battery) Battery model: 16340 4.2V Charging：DC-5V Wireless antenna gain: 18dbm Channel quantity: 57 Channels Storage temperature: -25°C -55 °C Working temperature: -10 °C -45 °C Single set weight : 48g Dimension 46* 40.5* 20mm Package content: 1*Transmitter 1*Receiver 1*fur windshield 1*fur windshield base 2*usb wire 1*Lav mic 2*3.5mm jack 2*battery 1*Carrying case 1*user manual